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34:1 Metal Gearmotor 25Dx67L mm HP 12V with 48 CPR Encoder
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71,98 €
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This gearmotor consists of a high-power, 12 V brushed DC motor combined with a 34.014:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 1632.67 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.
Key specifications:
| voltage | no-load performance | stall extrapolation |
|---|---|---|
| 12 V | 300 RPM, 300 mA | 11 kg⋅cm (150 oz⋅in), 5.0 A |
Alternatives available with variations in these parameter(s): gear ratio motor type encoders? Select variant…
Compare all products in 12V High-Power (HP) 25D mm Gearmotors.
These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6 V motors and three power levels of 12 V motors). The gearmotors all have the same 25 mm diameter case and 4 mm diameter gearbox output shaft, so it is generally easy to swap one version for another if your design requirements change (though the length of the gearbox tends to increase with the gear ratio). The motor and encoder portion is available by itself (no gearbox) for each combination of power level and nominal operating voltage, and versions without the encoder are also available. See the 25D metal gearmotor datasheet (2MB pdf) for more information, including detailed performance graphs for each gearmotor version. You can also use our dynamically sortable 25D gearmotor comparison table to search for the version that offers the best combination of speed, torque, and current draw for your particular application. A more basic comparison table is available below.
Note: The listed stall torques and currents are theoretical extrapolations; units will typically stall well before these points as the motors heat up. Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The recommended upper limit for continuously applied loads is 4 kg⋅cm (55 oz⋅in), and the recommended upper limit for intermittently permissible torque is 8 kg⋅cm (110 oz⋅in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes; a general recommendation for brushed DC motor operation is 25% or less of the stall current.
In general, these kinds of motors can run at voltages above and below their nominal voltages (they can begin rotating at voltages as low as 1 V); lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
These gearmotors are functionally identical to the previous versions we carried without end caps (they use the same motor, encoder, and gearboxes). The black plastic end cap is easily removable if you need to access the encoder or want to slightly reduce the overall gearmotor size, but there is a little bit of base plastic that will remain, as shown in the picture below:
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Details for item #4844
Exact gear ratio: 22×20×22×22×2312×12×10×10×10≈34.014:122×20×22×22×2312×12×10×10×10≈34.014:1
Dimensions
The diagram below shows the dimensions of the 25D mm line of gearmotors (units are mm over [inches]). This diagram is also available as a downloadable PDF (171k pdf).
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Dimensions of the Pololu 25D mm metal gearmotors with encoders. Units are mm over [inches]. |
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Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 6 mm (0.24″) into the screw hole.
Dimensions
| Size: | 25D x 67L mm1 |
|---|---|
| Weight: | 101 g |
| Shaft diameter: | 4 mm2 |
General specifications
| Gear ratio: | 34.014:1 |
|---|---|
| No-load speed @ 12V: | 300 rpm3 |
| No-load current @ 12V: | 0.30 A4 |
| Stall current @ 12V: | 5.0 A5 |
| Stall torque @ 12V: | 11 kg·cm5 |
| Max output power @ 12V: | 8.9 W |
| No-load speed @ 6V: | 150 rpm6 |
| Stall current @ 6V: | 2.5 A6 |
| Stall torque @ 6V: | 5.5 kg·cm6 |
| Motor type: | 12V, 5.0A stall (HP 12V) |
Performance at maximum efficiency
| Max efficiency @ 12V: | 44 % |
|---|---|
| Speed at max efficiency: | 260 rpm |
| Torque at max efficiency: | 1.6 kg·cm |
| Current at max efficiency: | 0.82 A |
| Output power at max efficiency: | 4.3 W |
General specifications
| Lead length: | 8 in7 |
|---|---|
| Encoders?: | Y |
Notes:
- 1
- Length measurement is from gearbox face plate to back of encoder cap (it does not include the output shaft). See dimension diagram for details.
- 2
- D shaft.
- 3
- Typical; ±20%.
- 4
- Typical, ±50%; no-load current depends on internal friction, which is affected by many factors, including ambient temperature and duration of motor operation.
- 5
- Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
- 6
- This motor will run at 6 V but is intended for operation at 12 V.
- 7
- May vary by a few inches.
PO-4844